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WO2021242006A1 - Structure de stator minimisant le couple de saillance - Google Patents

Structure de stator minimisant le couple de saillance Download PDF

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Publication number
WO2021242006A1
WO2021242006A1 PCT/KR2021/006544 KR2021006544W WO2021242006A1 WO 2021242006 A1 WO2021242006 A1 WO 2021242006A1 KR 2021006544 W KR2021006544 W KR 2021006544W WO 2021242006 A1 WO2021242006 A1 WO 2021242006A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
cogging torque
rotor
stator teeth
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2021/006544
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English (en)
Korean (ko)
Inventor
노순창
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020200078129A external-priority patent/KR102425813B1/ko
Application filed by Individual filed Critical Individual
Publication of WO2021242006A1 publication Critical patent/WO2021242006A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings

Definitions

  • the present invention relates to a stator structure, and more particularly, to a stator structure that minimizes cogging torque.
  • PM permanent magnet
  • Permanent magnet motors are widely used because of their high efficiency, simplicity, low noise and reliability.
  • the cogging torque is larger in the SPM motor.
  • Cogging torque is a torque generated by the magnetic force between the permanent magnet of the motor's rotor and the slot of the stator.
  • the cogging torque is generated regardless of the flow of current as long as there is a stator or a slot, so-called detent torque.
  • Cogging torque is not only a major cause of torque ripple, but also a cause of vibration and noise, and is also a major cause of reducing efficiency.
  • Cogging torque is generated in a stator having an iron core and a slot, and is generally generated by an imbalance of magnetic flux in an open slot structure. Accordingly, in order to minimize the cogging torque, the iron core may be removed or the slot may be removed.
  • the method of removing the iron core is called the coreless method
  • the method of removing the slot is called the slotless method.
  • the coreless method removes the iron core and winds with only a coil. Although it has the effect of minimizing the cogging torque, there is a disadvantage that the output density and efficiency are lowered due to the limitation of magnetic force transmission. am.
  • the slotless method uses the iron core as it is, it is a method of winding by configuring a slot on the iron core opposite to the rotor.
  • the present applicant came up with a structure that can minimize the cogging torque by filling the slot openings to maximize the efficiency of the generator and the motor by minimizing the cogging torque in various poles and slots.
  • An object of the present invention is to provide a stator structure that minimizes cogging torque and minimizes cogging torque in generators and electric motors of all structures.
  • a stator structure for minimizing cogging torque for solving the above-described problems includes a stator formed in an annular shape, a rotor positioned coaxially and rotatably disposed on the stator, and a coil wound around the stator It may include a stator tooth formed to have a predetermined width and provided with a plurality of protrusions protruding toward the rotor, a slot formed in a space adjacent to the stator tooth, and an insertion member inserted into the slot.
  • stator teeth It is formed at each end of the stator teeth, and may include a pole portion having a narrow portion formed to be stepped with a width smaller than the width of the stator teeth.
  • the pole part may further include an extension part extending from the narrow part toward the rotor, the width of which is gradually greater than that of the narrow part.
  • the maximum width formed by the end of the extension portion may be equal to or smaller than the width of the stator teeth.
  • the insertion member may be inserted into a portion of a slot formed by a narrow portion and an extension portion adjacent to each other of the stator teeth.
  • the insertion member may form a closed slot for closing the entire area projected to the outer circumferential surface of the rotor from the slot formed between the stator teeth adjacent to each other.
  • the number of the insertion members may be provided in a number corresponding to 1:1 to the number of slots.
  • It may include a blocking member formed to surround the narrow portion and the expanded portion of any one of the stator teeth of the stator teeth.
  • the blocking member may be formed to have a trapezoidal cross-section gradually widening toward the rotor, and may have a pair of leg portions bent in a direction adjacent to each other.
  • the number of the blocking members may be provided in a number corresponding to 1:1 to the number of the stator teeth.
  • the stator structure for minimizing cogging torque minimizes the cogging torque to minimize torque ripple, vibration, and noise, thereby improving the efficiency of the generator and the electric motor.
  • the cogging torque can be minimized by not only allowing the bobbin insertion member to be fitted to the lower end of the stator teeth as much as the thickness of the stator, but also contacting the legs of the adjacent blocking members with each other.
  • FIG. 1 is a plan view of a stator structure for minimizing cogging torque according to a first embodiment of the present invention.
  • Figure 2 is a perspective view showing a state in which the insertion member of Figure 1 is coupled.
  • FIG 3 is a plan view of a stator structure for minimizing cogging torque according to a second embodiment of the present invention.
  • FIG. 4 is a perspective view illustrating a state in which the blocking member of FIG. 3 is coupled.
  • FIG. 1 is a plan view of a stator structure that minimizes cogging torque according to a first embodiment of the present invention
  • FIG. 2 is a perspective view illustrating a state in which the insertion member of FIG. 1 is coupled.
  • the stator structure for minimizing cogging torque according to the first embodiment of the present invention is a stator 100, a rotor 101, a stator tooth 102, a slot 100a, and an insertion member. (120) may be included.
  • the stator 100 may be formed in a hollow cylindrical shape.
  • the stator 100 is disposed on the same axis as the rotor 101 , and is disposed in a shape surrounding the outer circumference of the rotor 101 to provide a ring-shaped void that is a space spaced apart from the outer circumferential surface of the rotor 101 .
  • the stator 100 may be protected by an external housing (not shown), and may be fixed to the housing.
  • the stator 100 may be arranged such that a plurality of stator teeth 102 on which a coil is wound, and a plurality of slots 100a, which are spaces in which the coil is located, surround the rotor 101 and form a radial shape. .
  • the stator teeth 102 may be formed to protrude from the inner circumferential surface of the stator 100 toward the central axis C or the rotor 101 in plurality, and a coil may be wound around the stator teeth 102 .
  • the stator 100 may be arranged to connect each stator tooth 102 as a ring shape.
  • a coil is wound around each stator tooth 102 to generate a magnetic flux when an external power is applied.
  • a plurality of permanent magnets may be disposed on the rotor 101 as will be described later.
  • the rotor 101 is a cylindrical member, and a rotating shaft (not shown) is inserted and fixed to the central axis (C), or is formed integrally with the rotating shaft to rotate with respect to an external conventional housing (not shown). can be installed.
  • a plurality of permanent magnets are installed in the rotor 101.
  • the permanent magnets are drawn in from the outermost part of the rotor 101 toward the central axis C by a predetermined distance. can be installed.
  • the permanent magnet has a rectangular cross section, and can be referred to as a linear permanent magnet when compared to a permanent magnet having an arc-shaped cross-sectional shape according to the outer circumferential shape of the rotor 101 .
  • a plurality of such permanent magnets may be provided and disposed at equal radial intervals with respect to the rotor 101 .
  • the permanent magnet may be embedded inside the rotor 101 .
  • an embedded groove (not shown) is provided on the side surface of the rotor 101 so that the permanent magnet is embedded, and the embedded groove may have two embedded grooves arranged in a V-shape or a radial shape.
  • the permanent magnet is coupled to the rotor 101 to provide a driving force for rotating the rotor 101 by reacting with a coil to which power is applied.
  • the stator structure that minimizes the cogging torque is an embedded type (IPMSM: Interior Permanent Magnet Synchronous Motor) in which a permanent magnet having a certain curvature is embedded in the inside of the rotor, a cylindrical embedded type, or a radially embedded type. It may include any one structure.
  • IPMSM Interior Permanent Magnet Synchronous Motor
  • the arrangement structure of the first permanent magnet forming the N pole and the second permanent magnet forming the S pole on the rotor 101 is asymmetric, or the polarity and the S pole forming the N pole on the rotor core
  • the polarities to be formed may be symmetrical to each other.
  • the permanent magnet is a magnet that preserves a strong magnetization state, and since it stably maintains the magnetism even if it is not supplied with electric energy from the outside, it is coupled with the rotor 101 and reacts with the coil to which power is applied to the rotor 101 can be rotated.
  • the permanent magnet provided to react with the coil to which power is applied to rotate the rotor 101 and the insertion member 120 to reduce torque ripple during rotation of the rotor 101 may be included.
  • the insertion member 120 may be made of a material similar to that of the stator 100 , and may be coupled between the adjacent stator teeth 102 one by one to fill the gaps between the adjacent stator teeth 102 .
  • the insertion member 120 has a structure that fills a space for every slot 100a along the inner circumferential surface of the stator 100, and by forming a closed slot, torque ripple can be reduced, thereby suppressing transmission and noise generation of the motor.
  • the cogging torque is generated due to the stator 100 and the slot 100a, to be precise, the cogging torque is generated because the slot 100a is open.
  • the generator and the electric motor are conventionally used in generators and motors. Since the cogging torque is minimized while using the same), most of the disadvantages of the split core can be eliminated.
  • a typical stator tooth 102 in a generator and an electric motor has a pole part 110 at the end.
  • the pole part 110 is to prevent the winding from flowing down after winding, and is mostly present in all generators and stators used in electric motors that do round winding.
  • the width d2 of the pole part 110 is formed to be larger than the width d0 of the fixed vehicle teeth 100 , it is impossible to wind the pole part 110 and insert it into the stator teeth 102 .
  • the length of the insertion member 120 at the lower end of the stator teeth 102 can be inserted as much as the thickness of the stator teeth 100 .
  • the pole part 110 may include a narrow part 111 and an extension part 112 .
  • the width of the stator 102 is formed to be stepped with a width d1 smaller than the minimum width d2 that gradually decreases from the maximum width d0 to the rotor 101 side, so that the width of the narrow portion 111 is stepped.
  • (d1) may be formed to be smaller than the minimum width (d2) of the stator teeth (102).
  • the width d2 of the extension 112 may be equal to or smaller than the width d2 of the stator teeth 102 .
  • the width d1 of the narrow portion 111 and the width d2 of the expanded portion 112 secure the insertion groove 100b into which the insertion member 120 can be inserted and at the same time minimize the gap between the slots 100a. It can be designed to the extent possible.
  • the insertion member 120 may be inserted into each space 100b provided between the adjacent stator teeth 102 . That is, the number of insertion members 120 may be provided to correspond to the number of slots 100a 1:1.
  • the stator structure for minimizing cogging torque according to the first embodiment of the present invention is implemented as follows.
  • each stator tooth 102 is formed in a straight shape so that a bobbin can be inserted from the inner diameter (outer diameter in the case of an outer rotor) of the stator 100, and adjacent pole parts 110 of each stator tooth 100 An insertion groove (100b) provided therebetween is formed to couple the insertion member (120).
  • the insertion groove 100b may have various shapes, but it is preferable to design a tolerance in advance so that no play is generated so that vibration does not occur after assembling the insertion member 120 .
  • FIG. 3 is a plan view of a stator structure for minimizing cogging torque according to a second embodiment of the present invention
  • FIG. 4 is a perspective view illustrating a state in which the blocking member of FIG. 3 is coupled.
  • the insertion member 120 is inserted, whereas the blocking member 220 surrounding the pole part 110 of the stator tooth 102 of the stator 100 of FIG. Duplicate descriptions of the components are omitted.
  • the stator for minimizing the cogging torque includes the narrowed portion 111 and the expanded portion 112 of any one of the stator teeth 102 of the stator 100 . It may include a blocking member 220 formed to surround.
  • the blocking member 220 may have a pair of leg portions 221 that are formed in a trapezoidal shape in which an area is gradually increased toward the rotor 101 and are bent in a direction adjacent to each other.
  • the blocking member 220 is configured so that the leg portions 221 of the blocking members 220 adjacent to each other can contact each other so as not to form a gap between the stator teeth 102 adjacent to each other to form a closed slot.
  • both the stator for minimizing cogging torque according to the first embodiment of the present invention and the stator structure for minimizing cogging torque according to the second embodiment of the present invention may have increased durability due to vibration.
  • stator structure for minimizing the cogging torque according to the second embodiment of the present invention can minimize the cogging torque regardless of the combination of the number of poles and the number of slots of the electric motor.
  • the combination with the highest LCM of the number of poles and the number of slots has the smallest cogging torque. Since the cogging torque can be minimized by being combined, the cogging torque can be minimized in all poles from 2-pole to multi-pole regardless of the number of poles.
  • the cogging torque can be minimized by not only allowing the bobbin insertion member to be inserted into the lower end of the stator teeth by the thickness of the stator, but also contacting the legs of the adjacent blocking members with each other.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne une structure de stator qui réduit au minimum le couple de saillance. La structure de stator qui réduit au minimum le couple de saillance comprend : un stator formé de manière annulaire ; un rotor situé de manière coaxiale avec le stator et disposé de manière rotative ; des dents de stator formées avec une largeur prédéterminée de telle sorte qu'une bobine est enroulée autour du stator et comprenant une pluralité de saillies faisant saillie vers le rotor ; une fente formée dans un espace adjacent à l'autre des dents de stator ; et un élément d'insertion inséré dans la fente.
PCT/KR2021/006544 2020-05-26 2021-05-26 Structure de stator minimisant le couple de saillance Ceased WO2021242006A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20200062857 2020-05-26
KR10-2020-0062857 2020-05-26
KR1020200078129A KR102425813B1 (ko) 2020-05-26 2020-06-26 코깅 토크를 최소화하는 고정자 구조
KR10-2020-0078129 2020-06-26

Publications (1)

Publication Number Publication Date
WO2021242006A1 true WO2021242006A1 (fr) 2021-12-02

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ID=78744744

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2021/006544 Ceased WO2021242006A1 (fr) 2020-05-26 2021-05-26 Structure de stator minimisant le couple de saillance

Country Status (1)

Country Link
WO (1) WO2021242006A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025197A (ja) * 1999-07-06 2001-01-26 Nissan Motor Co Ltd 電動機のステータ
US20020149282A1 (en) * 2000-05-06 2002-10-17 Markus Heidrich Stator
JP2009268178A (ja) * 2008-04-22 2009-11-12 Mitsubishi Electric Corp 電動機
JP2010081715A (ja) * 2008-09-25 2010-04-08 Toshiba Mitsubishi-Electric Industrial System Corp 回転電機
US20130049520A1 (en) * 2011-08-26 2013-02-28 Jonq-Chin Hwang Stator structure and method for manufacturing the same
KR20160043307A (ko) * 2014-10-13 2016-04-21 이래오토모티브시스템 주식회사 차량용 교류발전기의 고정자

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001025197A (ja) * 1999-07-06 2001-01-26 Nissan Motor Co Ltd 電動機のステータ
US20020149282A1 (en) * 2000-05-06 2002-10-17 Markus Heidrich Stator
JP2009268178A (ja) * 2008-04-22 2009-11-12 Mitsubishi Electric Corp 電動機
JP2010081715A (ja) * 2008-09-25 2010-04-08 Toshiba Mitsubishi-Electric Industrial System Corp 回転電機
US20130049520A1 (en) * 2011-08-26 2013-02-28 Jonq-Chin Hwang Stator structure and method for manufacturing the same
KR20160043307A (ko) * 2014-10-13 2016-04-21 이래오토모티브시스템 주식회사 차량용 교류발전기의 고정자

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